Cannot post Youtube video, just getting a big black box.

I still cannot post a video on Youtube. They used to work, now I just get a big black box.
The video I'm trying to post: <iframe width="560" height="315" src="http://www.youtube.com/embed/VFsAEKPjMu8" frameborder="0" allowfullscreen></iframe>
My blog: http://leatherandgrace.wordpress.com
I've already posted this question elsewhere, STILL have not gotten a response or resolution!!

You keep saying "use the shortcode," I keep doing that, it still doesn't work. The sample videos you're showing also display a big black box. I've also looked at some other WordPress blogs with videos, and they all show big black boxes. Sounds more like something's wrong with WordPress in this regard ... So when are you going to look into it and fix it???